Dauer



[No M01181.) 2 Sheets-Shea; 1. G. P. LANDAUBR. PROCESS OF DYEINGLEATHER.

No. 418,414. Patented Dec. 31 1889.

\No Model. 2 Sheets-Sheet 2.

G. F. LANDAUER. PROCESS 0P DYBING LEATHER.

No. 418,414. Patented Dev. 31, 1889.

WITNESSES INVE'NI'O}? UNITED STATES PATENT OFFICE.

GEORG FRIEDRICH LANDAUER, OF FRANKFORT-ON-TllE-MAIN, GERMANY.

PROCESS OF DYEiNG LEATHER.

SPECIFICATION forming part of Letters Patent No. 418,414, dated December31, 1889.

Application filed June 21, 1888. Serial No. 277,746. (No specimens.)

To all whom it ntay concern:

to it known that I, GEORG FRIEDRICH LAN- DAUER, manufacturer, residingat Frankforton-thc-Main, in the Empireof Germany, have invented new anduseful Improvements in Dyeing Leather, of which the following is aspecification.

This invention relates to a method or process of dyeing leather.

The said method or process consists, principally,in causing, during theheating of the dye-bath by means of steam and admixed atmospheric air,the necessary movement of the dye-liquor in order to effect a uniformdeposition of the dye or coloring-matter upon the leather, andconsequently the regular or equable dyeing of the same.

The apparatus by which I prefer to prac tice my process is representedin the accompanying drawings, wherein- Figure 1 represents the apparatusin iongitudinal section, and Fig. 2 the same in cross-section.

In a wooden box or receptacle A, which is of oblong shape in plan, isplaced a dye box or vessel B, which consists of galvanized sheet iron orcopper or any other suitable material, and is made of similar shape butof smaller dimensions than the outer box or receptacle A, so that aspace Z is formed between the walls of the two boxes, which space isfilled with water. The latter enters the intermediate space Z at or nearthe bottom of the outer wooden box through the pipe I) and leaves itagain at the upper part through the pipe 0. At the bottom of the saiddye box or vessel B and in the middle of the latter are placed inproximity to its walls two pipes D D, which present an oblong figure inorder to correspond in shape to the plan of the box, and which areprovided at their upper sides with small holes. These pipes communicatewith a pipe L on the outside of the outer box, the latter pipe having atits end a Kcrting or other suitable steam-jet blower E, which is set inconnection with a steamadmission pipe adapted to be closed by avalve. Onthe longer vertical sides of the oblong dye box or vessel B, at itsupper and middle part, are placed sheet-metal strips a a, arrangedobliquely. The flesh sides of two hides H to be dyed having been putagainst each other, the said hides are secured by hooks to a bar 0,placed above the dye box or vessel in such a manner that they aresuspended in the middle of this box or vessel and that the dyeliquorwill circulate in contact with their surface. For facilitating theintroduction and removal of the hides the aforesaid bar G is adapted tobe placed at the upper end of the outer box or receptacle at C.

When the dye box or vessel B is filled with the dye-liquor and the hidesH areiinmersed in it in the described manner, the steam-jet blower E isset in action by opening the inletvalve in the steam-pipe and forces,besides steam, atmospheric air into the oblong pipes D D in the dye boxor vessel. Through the small holes at the upper side of these oblongpipes D D the steam, mixed with air carried with it, is forced into thedye-liquor. The steam is for the purpose of heating the dyeliquor andsetting it in motion, while the atmospheric air is designed to preventthe liquor from becoming too hot and also to enable a moderate amount ofsteam to produce the requisite movement of the liquor. The Ohliquesheet-metal strips cause the liquor to circulate in the dye box orvessel B on the outer sides of the hides H in such a manner that theliquor passes equably in contact with both hides, thus preventing moredye or coloring-matter being deposited at one point of the hide than atanother. This circulation is represented in the accompanying drawings byarrows.

By reason of the continual movement of the dye-liquor the dyeing of thehide will be absolutely regular and uniform.

The overheating of the dyeliquor is obvi ated by allowing, whennecessary, more cold water to pass through the intermediate space Zbetween the two boxes or receptacles A and B. By suitably arranging thespace the dyeliquor can always be readily maintained at the temperaturebest adapted for the dyeing operation.

According to the various sizes of the ap paratus, either one or morethan two oblong pipes can of course also be used in lieu of two pipes,as described and shown in the drawings, with a correspondingly smalleror larger number of the sheet-metal strips (t a. The latter may in somecases be dispensed with if several pipes are arranged close to eachother.

Having thus described my invention and the manner of employing the same,what I claim, and wish to have secured to me by Letters Patent of theUnited States of America,

1. As an improvement in the art of dyeing leather, wherein thedye-liquor is heated and the desired movement of the same is effected bythe introduction into the dye -bath of steam and atmospheric air, themethod of preventing the overheating of the dye-liquor and maintainingthe same at a suitable temperature, the same consisting in immersing thedye-liqnor-containing vessel in cold flowing water, substantially as setforth.

2. The herein-described improved method of dyeingleather, consisting insuspending the hides in a dye-bath, injecting mixed steam and air intosaid bath to circulate and heat the liquor, deflecting the liquor inmotion against the hides, and passing a current of cold liquid incontact with the exterior of the dye-bath vessel, substantially as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORG FRIEDRICH LANDAL'ER.

\Vitnesses:

FRANZ WIRTH, J OSEPH PATRICK.

